Abstract: Traditional PPI display can only show 2 D information without height information and the 3 D information cannot be show directly. But a 3D radar display can show three-dimensional radar information. This it provide more information to observer. A concept of 3D radar displayer is designed in this paper. The basic principles include perspective projection , multi-resolution terrain render, 3D object model display and the system simulation flow are introduced. The simulation resuh proves that 3D display has good effectiveness, and the system concept is feasible. It would provide a foundation for the 3D radar display and its realization.